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' A. P. PRITSGHAUL POLISHING AND ABRASIVB MATERIAL. No; 574,449.

Patented Jan. 5, 1897.

wmwxfm M j W mssxsz filings or scales, rottenstone,

UNITED STATES PATENT OFFICE;

.-\RTIIUR F. PRITSCIIAU, O1 PITTSBURG, PENNSYLVANIA, ASSIGNOR OF I ONE-HALF TO ALBERT PETTII, OF SAME PEACE.

POLISHING AND ABRASIVE MATERIAL.

SPECIFICATION forming part of Letters Patent No. 574,4 49, dated January 5, 1897. Application filed December 16, 1895. Serial No. 572,302. pwim ua eut .the same up into small bits, and put into a suitabe vessel containing fourto five hundred parts of benzene or some other good solvent. This being done I close the lid airtight, set the vessel aside for a few days, but I agitate the contents now and again. \Vhen it is found that the caoutchouc is thoroughly dissolved, I add from one to two parts of scription of the invention, such as will enable i othersskilled in the art to which it appertains to make and use the same, reference being had 5 fifty to two hundred and fifty sulfur for vulcanizing purposes and from parts of any of i the abrasive, polishing, or scouring material.

to the accompanying drawings, which form a v part of this specification.

My invention relates to a new article of rasives the larger, of course,

manufacture for abrasive polishing a nd so on ring purposes, and will be particularly described hereinafter.

? black, or any In the accompanying drawings, Figure 1 laccordiug to the quantity of benzene conrcpresents a sponge treated and prepared according to my invention, and Fig. 2 is an imaginary cross-section of such sponge.

I now desire to more nnnutely show'howI prepare the mixture and how I accomplish the production of the polishing material.

Abrasive powder, used by me to carry out my invention, may be had from emery, carliorunduln, flint, )umiee-stone, or corundum, crushed or reduced to a powder. In addition to the above the followingsubstances may also 5 be used for the same'purposeviz. carbonate tai ned therein. impregnate the sponges with a large quantity The greater the speciiiegravity of these abshould be the number of parts added. The parts are given by weight only. For coloring-matter I use chrome-yellow, vermilion, yellow ocher, lampother suitable pigment.

The mixture aforesaid will be thick or thin,

I make it thick when I wish to of the mixture and thin when a smaller quantity is desired. The proper mixture being thus provided in a suitable vessel, I place the sponges treated as aforesaid therein, close the vesselair-tight, and while the saturation is go- 1 ing on to hasten the same I shake the vessel 1 once in a while, and when the sponges are thoroughly saturated with the mixture I take them out and place them on a wire screen or on of magnesium, tripoli, French chalk, iron on I cause the sponges to be turned frequently bran, &c. For my purpose of course said substances are to be also reduced to powder. powdered abrasive provided, I next take an ordinary sponge, moderately dampen the same, and put it into a suitable vessel containing one or a mixture of one or more of said abrasives, and to thoroughly fill the pores and cells of the sponge with the abrasive 1 cause the sponge to be agitated or shaken properly while in the vessel. lIaving treated liaving such a slats to be dried. \Vhile this drying is going to prevent the mixture from dripping cit. Before the sponges are quite dry, when still damp, in fact, I put them in a vessel containing more abrasive material of the same kind and shake or agitate them again therein. After thus subjecting the sponges to the operation just described to gather more abrasive 1 a wire-screen or slats to be thoroughly the sponge in this manner, another treatment 1 is necessary to perfect the article for the purpose intended. This I accomplish by a mixture of eaoutehouc, sulfur, and some colorin g matter.

As an illustration, I take a uantity of caoutchouc, say twenty-six parts, perature of about the excess of abrasive material.

material I take them out and again lay them on dried. After being so dried I put them in a vessel or perforated revoluble cylinder to shake off Then comes the last operation, and this consists of vulcanizing the sponges thus prepared. This requires from ten to twenty minutes at a tem- 26 to 295 l ahrenheit.

After vulcanizing the sponges should be soft and an abrasive powder, vulcanized, SllbStZtll- 10 and pliable. tially as described.-

Having thus described myinvention, what In testimony whereof I affix my signature I claim, and desire to secure by Letters Patin presence of two'witnesses.

5 out isi 1 As a new article of manufacture an nbra- ARTHUR P PRITSOHAU' sive polishing and scouring material consist- Witnesses: ing of an ordinary sponge combined with and J. K. HARBOUR,

filled with a mixture of caoutchouc, sulfur G. \V. BRUNER. 

